DB,
I am loading H-1000 with a 168 TSX.Great load!Called and talked to a Hodgdon tech and he says my load should be completely safe and within their pressure limits.I have worked up to 83 grs.If your careful and have a good chronograph you can probably do the same with the 168 CT.
Jim

I have a maximum load of 81.5 grain using Hornady 180 BTSP so you could start with that and work your way up. H-1000 is very stable powder. It's my favorite powder for my 300 Winchester Model 70 Laredo.

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To achieve the maximum possible accuracy, all variables must be remove or at least minimize.